// Example 1
MessageWindow.Show("Message");

// Example 2
MessageWindow.Show("Caption", "Message");

// Example 3
MessageWindow.Show("Caption", "Message", MessageIcon.Information);

// Taking the result
MessageWindow.Show<string>("Caption", "Message", MessageIcon.Information, b => Debug.WriteLine(b), "Default", "Yes", "No");

// You can also use as Window
MessageWindow.Show(DialogMode.Modal, windowsConatiner, "Caption", "Message", MessageIcon.Information);